【单选题】_____ they may not succeed, they will try their best.
【简答题】设递增等差数列 的前n项和为 ,已知 , 是 和 的等比中项. (l)求数列 的通项公式; (2)求数列 的前n项和 .
【单选题】-They say that they will try their best _their dreams.
【单选题】______ they may not succeed, they will try their best.
【单选题】They will try their best in the Dragon Boat Racing _______ they may fail.